I created Postwoman, an online, open-source API request builder

In plain words

Postwoman is an open-source API request builder available online, designed for developers who need to test and debug APIs. Launched in 2019, it provides a web-based interface for constructing and sending API requests without requiring installation. The tool is freely available as open-source software, making it accessible to developers of all experience levels who want an alternative to desktop-based API testing applications.

written from the facts on this page · September 2026

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  Postwoman2019 · postwoman.io · ▲7

  API request builder - Helps you create your requests faster.

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  Postman2014 · postman.com · ▲182

  Postman is a powerful HTTP client to test REST API

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  Postman for Mac (Beta)2016 · postman.com · ▲372

  Build, test, and document your APIs faster

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  Library of API collections for Postman2017 · postmancollections.com · ▲77

  Accelerate API development with Postman's all-in-one platform. Streamline collaboration and simplify the API lifecycle for faster, better results. Learn more.

• OS
  Open-source Postman alternative with type safety2023 · recipeui.com · ▲275

  Hello! This is Jeane and Samuel and we’re building RecipeUI. RecipeUI is an open source Postman alternative that uses TypeScript to statically type and autocomplete requests. We built this because current API tools don’t deal with the fact that some APIs are just painful to work with. For us, it’s usually error after error as we try to figure out how to properly form the first request. We recorded a demo to show you how TypeScript helps us autocomplete a request correctly. https://youtu.be/O_Mly_p-g5s How does our platform improve the developer experience? The analogy is…

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  ElvaSep 2026 · getelva.ai · ▲303

  Goodbye, Postman. Your APIs have new consumers

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  Talanoa▲345

  Hi HN, I’m a fullstack developer, and honestly, I’ve lost count of how many side projects I’ve worked on over the years. But one idea kept coming back to me: a different kind of email client. It first came to me in 2014: “What if we could handle emails more like conversations?” Every year, I’d revisit this concept in my “Build Notes.” Ten years later, no one had built exactly what I had in mind — so I finally decided to do it myself. That’s how Talanoa was born. I wanted something focused on people, not timelines. I was tired of marking messages as unread just to remember to reply later, or…

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